Modélisation de l’écoulement souterrain et du transfert des radionucléides de la chaîne de désintégration aux abords d’un bassin de déchets d’uranium en projet en Inde Modelado de flujo de agua subterránea y de desintegración de radinucleidos – cadenas de transporte alrededor de relaves de uranio en India. 地下水流和放射性核素衰变链运移模拟-以印度某铀矿尾矿坑为例 Modelação do fluxo das águas subterrâneas e do transporte de decaimento em cadeia de radionuclídeos em torno de uma proposta de uma lagoa de rejeitados de urânio na Índia

Elango, L.; Brindha, K.; Kalpana, L.; Sunny, Faby; Nair, R. N.; Murugan, R.

Modélisation de l’écoulement souterrain et du transfert des radionucléides de la chaîne de désintégration aux abords d’un bassin de déchets d’uranium en projet en Inde Modelado de flujo de agua subterránea y de desintegración de radinucleidos – cadenas de transporte alrededor de relaves de uranio en India. 地下水流和放射性核素衰变链运移模拟-以印度某铀矿尾矿坑为例 Modelação do fluxo das águas subterrâneas e do transporte de decaimento em cadeia de radionuclídeos em torno de uma proposta de uma lagoa de rejeitados de urânio na Índia | Groundwater flow and radionuclide decay-chain transport modelling around a proposed uranium tailings pond in India

2012

Extensive hydrogeological investigations followed by three-dimensional groundwater flow and contaminant transport modelling were carried out around a proposed uranium tailings pond at Seripalli in Andhra Pradesh, India, to estimate its radiological impact. The hydrogeological parameters and measured groundwater level were used to model the groundwater flow and contaminant transport from the uranium tailings pond using a finite-element-based model. The simulated groundwater level compares reasonably with the observed groundwater level. Subsequently, the transport of long-lived radionuclides such as 238U, 234U, 230Th and 226Ra from the proposed tailings pond was modelled. The ingrowths of progenies were also considered in the modelling. It was observed that these radionuclides move very little from the tailings pond, even at the end of 10,000 y, due to their high distribution coefficients and low groundwater velocities. These concentrations were translated into committed effective dose rates at different distances in the vicinity of the uranium tailings pond. The results indicated that the highest effective dose rate to members of the public along the groundwater flow pathway is 2.5 times lower than the drinking water guideline of 0.1 mSv/y, even after a long time period of 10,000 y.

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